according to this manual it could any of the fuzes.
Sorry Kiwi, but incorrect in this instance, because the identification is wrong. DJ, your item is not an M32, at least not that anyone has been able to show. I believe that it was a proprietary attempt to update the M32/38/40 series of submunitions, which ultimately failed.
The golf ball size submunitions were fielded in the 50s - 60s, used in systems like the Honest John, Sadeye, etc. They were in many ways very typical of the munitions of the era, though the series suffered due to the size of the munitions vs its fuze, limited by the technology of the day. The fuze was just too large and took up much of the explosive capacity. The series ultimately saw little use in Viet Nam, surpassed by the BLU 26 series which had a much greater explosive/weight ratio.
Sometime in the 1990s variants of your piece started to show up. I've seen them with several minor differences, but most are recognizable as from the same series. They are different from the older golf balls in construction, materials and size (slightly). The easiest to see is the clamp band used to hold the hemispheres together. On the newer version it is flat and inset, lighter and of a different material. The bodies of the golf balls were an aluminum matrix, with steel balls imbedded. The newer versions are frequently found as plastic, or a light alloy of unidentified metal. The flutes are different, and there is no stabilizing flute running 90 degrees from the rotation flutes. I have not had the opportunity to Xray one, so I don't know if the newer versions were ever dummy loaded.
I've never seen one of the newer ones that looked as though it had been dropped or in the field (impact or weather damage), leading me to suspect that they were only a model for discussion, display or exploration of a concept. Still, an interesting piece. Them showing up in the 90s could mean development in the late 80s, I was at White Sands from 85-89 and they never showed up there. We had many of the old test fields from the golf balls and their predecessors there with remnants of the history, but no new variants were dropped during my tenure. Maybe someday someone will find a desktop display with actual ID or company name on it.
It can be hard to make an ID on some of these pieces without accurate publications or items that you can make a comparison with. The pubs are just not that good and there are so many variations. I've attached a photo of some of mine to give you an idea. I'm at work right now so this is a poor photo from a shelf shot in my files, but you get the gist. Each of these is different from the others in some manner.
![IMG_1216.JPG IMG_1216.JPG](https://www.bocn.co.uk/data/attachments/117/117014-af7369763b37dd9c128025fccc9a0f0d.jpg)