Try this.....its a bit more up to date in terms of the different systems. Might help
https://www.retrobike.co.uk/threads/decoding-marin-frame-numbers.433668/
https://www.retrobike.co.uk/threads/decoding-marin-frame-numbers.433668/
Ah, well, still a frame/build to look forward to.Not sure the system applies to hybrids or 700c.
Thanks yeah I saw that earlier in the comments, just can't be a coincidence being a postcode? Thought the 20 20 would have a reference as I've seen the 4 digits on a few postsThe aluminium frames dont use the above dating method im afraid.....
But somebody might be able to help you from the pictures...