Nice little carbine you have there. As you might know by now this was made from a long rifle based on the rear sight on the rifle. Your markings are worn but I think the date stamp is likely that this rifle was accepted into service in 1920. From there it would have been cut down and modified to the M95/30 configuration. After that it was sent to Bulgaria, who refurbished it post-WWII.
Here is a good read for M95 related information.
http://www.hungariae.com/Mann9530.htm
The clips for your rifle are often called Mannlicher clips after there designer. The American term is often 'en-bloc' after the M1Garand. Many of the M95 Mannlicher clips you find are from the late 30s. It is neat as you mentioned as some are marked with the little swastika eagle on them and some are marked with the Austrian Double-headed eagle. I have some in the original boxes, with ammo from I believe July and August 1938, and you can see the change over from Austrian government to Nazi government very clearly as the ammo received the swastika eagle when the change over happened.
Cool little carbine, hope you enjoy it.