To polish off a wonderful day, I met a very nice fellow who has a huge inventory of ex military disposals stock, and allowed me to paw and drool through his wares. I've met so many interesting people in past few years, and I rarely seem to have enough time available to just sit and chat with them. The gentleman I met today is a point in case. I could have spent hours talking about mutual interests and hearing his life experiences.
The above item is a aiming/ranging scale of some sort, for a Vickers MG. I didn't set out to find one, but having seen it today, I was taken by the detail in manufacture, and thought it would be a good souvenir of the day, and the trip overall.
No idea of manufacture date or exact usage, but I'm sure someone here can enlighten me. It only measures roughly 6" by 3" in main dimensions, and has further information etched onto it's sides and the reverse of each slide. Most intriguing thing is the piece of string attached, which has a small ferrule on the end, and is exactly 24" in length. The length is stated in a location on the device itself, and is indicated for "Graticule Use", whatever that is!
Any additional info on this item, guys?