Cable release sockets.
Because pressing the shutter could easily cause camera shake at slow shutter speeds, a cable release was provided on most makes of cameras. Cable release was not provided on VPK's but were available as an add-on accessory. A nickel plated bracket was screw fixed to the camera so that a threaded hole for a cable release was over the shutter release.
These are located on the inner surface of the swing-down camera support foot. Unfortunately these numbers are unreliable for estimating the year of manufacture.
Kodak had camera service centres to which owners could send their cameras to be serviced. The fact of this attention would be shown by a Kodak sticker affixed to the rear surface of the lens plate.
Always a problem is how to display and yet protect cameras which have been so carefully collected. Convenient for this is the inexpensive IKEA Jarna cabinet which will hold up to 18 VPK cameras. Wall mounted at eye level, the contents are easily seen through sliding class doors. Whether to display cameras closed, full or partially open is a problem. Convenient is partially open which gives visual proportions to the camera and places less stress on the bellows as well as maintaining their folds.
Although Kodak stopped making 127 roll films in 1995, monochrome negative 127 roll film is still available. An internet search will find several suppliers in the U.K. and elsewhere. Made under Du Pont licence in Croatia, the film has a speed of ISO 100.