Here is an image of the label and some of the grooves. Notice that there are no extra holes in the centre. The grooves are very fine and appear under a loupe to have the information on the bottom of the groove, like an Edison Diamond Disc. In fact the grooves are quite a narrow thread. This recording was taken at the New England Conservatory music department, probably in Brown Hall. The conservatory has no interest in helping me with this, which is not surprising. The ensemble and conductor on the record was a legendary part of the Boston church music establishment and university establishment and is still an internationally known name. Since this is, as far as I know, the only existing recording of this man's work, I don't want to play it on the wrong equipment. If it's an acetate, it shows no signs of a glass or aluminum base, and no separation or stearate dust, etc. It appears to be a pressed record.