That E/655 is a fraudulent marking. The size gives it away. Some A-H applied the marking to good mags.
The marking dies are plentiful. This link is to a eBay seller that has multitudes of dies to make your gun "original".
Link:
https://www.ebay.com/itm/20468958894...sAAOSwCall7ysZ
This deception hurts all collectors, both new and experienced. It deceives the unknowledgeable and can ruin original examples.
The forum rules preclude me from using the language I would normally state.
G2