Need help with hallmarks PLEASE!!

Hi everyone! We recently purchased a silver hip flask and have been having a very hard time finding any information about the hallmarks. We’ve searched the web and have found a few photos of items with the first mark, but the middle and especially the last hallmark have been TOUGH- we’d REALLY appreciate any clues or insight anyone may have about them! Lastly, the third hallmark seems to be worn down quite a a bit but from what we think, the shaping strongly resembles a hallmark found here: [url]http://www.silver-collector.com/topic2673.html[/url] Also- the first hallmark on their post is the same as ours- but sadly no one ever responded to their post.
Our flask:

Again- ANY information or thoughts would be greatly appreciated, thanks!!!

It’s pewter from the Association of British Pewter Craftsmen, founded in 1970.
Supported by the Worshipful Company of Pewterers who used the seahorse mark from 1980.
Regards
John