In the darkest part of the workshop I have found a load of strip clips (or chargers, or whatever they're called).
I believe they may be for 9mm as the 9mm cases fit in them nicely and 5.56 doesn't quite stay in. They hold 8 rounds. I haven't gone through my collection to see what else fits but I'd guess it'd be a more common military round to go to the expense of making them. Most are plated with nickel or similar and one or two look to be parkerised.
Some are numbered with a letter (O mostly, one or two X and a C) and a number (all low 50s) which may be a year number.
The construction is similar to standard NATO 5.56 strips with the spring clip in the middle to hold the rounds in place but no tab at the ends.

Any idea what firearm they could be for?
Thanks.