You need a 351420 stem which is £2.20 from Cousins.
To save you registering, would be happy to order one for you on my account.
Edit: you'll probably have to cut it to size to match the old stem.
Thanks for the info and offer. Out of interest, how did you establish that the 351420 stem is the one required? My Google skills have let me down...
https://watchguy.co.uk/technical/Seiko/4205A.pdf
My Google skills have let me down...
Or like riding a fixie
@pifko started
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You need a 351420 stem which is £2.20 from Cousins.
To save you registering, would be happy to order one for you on my account.
Edit: you'll probably have to cut it to size to match the old stem.