Might be a proto for the 2020 release of any number of balls. The Prov1 and Prov1x 2022 white box for 2023 had 388 and 348 stamped on them ........ They can say anything on them so that Titleist will know which ball is being tested in the field, when the responses are returned from those participating. Test balls are sent out in white unmarked boxes to be tested and results sent back in to Titleist. Select members of TT get the opportunity to participate in the testing process and we have no idea what we are testing, along with others chosen by Titleist. Only the folks at Titleist who conduct the testing would know. Those of us on the Team Titleist site are Titleist loyalists like yourself, not employees of Titleist. Nice ball to hang on the wall with your collection or just play it and enjoy the day. Hakuna matata. =)

sport on I still have them two sleeves of each in the test white boxes.

It’s really cool being included in the testing for the next seasons golf ball.

I feel Titleist actually do listen to Team Titleist’s opinions on how the ball reacts and take that information on board before releasing the retail model.

We really appreciate this thanks Titleist

I was lucky enough to get 2 sleeves of AVXs this year. I consider it an honour whenever I get asked.

Replying for the update.

If 2019 was intended as the release year, then a black or red number could imply V or X prototype The non-Pro-V balls usually come out in even years. Since they aren't registered with the USGA for competition, there won't be much information to find.
The eBay asking price isn't the same as the sold price. Although Pre-V1+ balls were selling for $200+ a dozen. I'm not inclined to pay more than the MSRP, especially for a ball not otherwise in the marketplace..

I was fortunate enough to receive a sleeve of the AVX prototype golf ball. I love the feel very soft and plenty of spin into the green definitely a ball. I will be playing in 2024.

The 2019 Proto was the test ball for the 2019 ProV balls, if I remember correctly. I hav done with a black #1 sitting on my display shelf.

I received the white box of golf balls. Waited for some better weather to test them.
I tested in wet weather , cold , and warm weather.
I like the way all the balls feel, they fly well in all weather with some roll out.
I was able to draw and fail the ball on command as I expected from Titleist.
Very good off the driver and long irons. Mid irons were were great with these test balls.
Wedge shots were excellent, the ball bit very well. Putting with this ball , I felt was perfect for me as I like a soft feel when putting. They rolled true, and was able to control speed on very fast greens.
I would recommend this ball to every one.
Thank You for the opportunity to test them..

The 388 and 348 were excellent test balls. The difference in spin causing one ball to back up and the other to stop and maybe bounce forward a foot was very interesting. Depending on conditions, dry or wet, either ball may be the one to play.

I also received a sleeve of golf balls from Titleist. I currently play AVX, I did not notice any difference with length or direction. What I did notice and really liked was putting and the feel around the green. When you chip it, it stops on the green nicely. Thanks Titleist, feel free to send me more golf balls to test.

Thank you for the opportunity to participate in the testing of a prototype ball. For reference, my preferred ball is the Titleist AVX, although I sometimes play a Pro V1. Therefore, my experience and thoughts concerning the Feel, Distance, Spin and Control of the TEST ball are in reference to the performance I’m accustomed to while playing the 2023 Titleist AVX.

(FEEL). I found the TEST ball to be very soft. (For reference, I’m 64 years old, 6 HDCP, Driver speed 100 mph). Off the driver the ball felt noticeably soft. I don’t consider its soft feel to be terribly negative. One of the reasons I prefer the AVX over PRO V1 is because I find is slightly softer. But in an effort to be exacting, the prototype was too soft for me off the driver. From 100 yards in its soft feel was much less disconcerting.

(DISTANCE) I which I could be more exact on the subject of distance. I only played the prototype on the course with a temperature of roughly 70 degrees. I didn’t have the opportunity to hit the TEST ball in a simulator under controlled conditions. Therefore I don’t have any Trackman performance numbers as reference. That being the case, I didn’t notice any appreciable difference in distance with the TEST ball throughout my bag in comparison to the AVX I normally play. Again for reference: if pressed for an answer, I’d say I find the PRO V1 slightly longer than AVX off the tee with driver. And the AVX slightly longer in total distance off long and mid irons but only longer because I get a slightly more penetrating ball flight with more rollout. But from 100 yards in, I can’t really decipher any difference in on course performance. I believe I was getting a similar (slightly more penetrating) ball flight with the prototype ball that I get with AVX in comparison to PRO V1.

(SPIN) Because I thought the test ball was particularly soft, I wasn’t expecting exceptional spin on short irons. That turned out not to be the case. I was getting tremendous spin performance hitting full swing sand wedge (90 yds.) from tight fairway lies. I dropped all 3 prototype balls several times throughout my round and hit full P wedge (44 degree T100S) full gap & sand wedge, and every time I struck the test balls well, spin performance was excellent with sand wedge shots frequently backing up.

(CONTROL) To be more exacting, I feel I’d need more than 1 sleeve to assess control more objectively. I’d like the opportunity to hit 10 drives in succession while trying to intentionally shape a shot etc. while I have the ability to shape a shot, my talent/ability to do so is hardly precise enough to make absolute claims about the prototype ball. That being understood: I definitely got the impression the ball was getting less side spin off my driver face while I was trying to intentionally draw the ball. It just seemed to want to fly straight and somewhat resisting my efforts. This baffles me to some degree. I say that because I was getting plenty of ball spin off short irons. So why did seem somewhat resistant to accept spin off my driver?