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@amey
according to this list it's probably the seiko 0 shutter = copal 0.
http://www.subclub.org/fujinon/byfl.htmso you need a board for copal #0 size.
https://www.ebay.co.uk/itm/genuine-Toyo-field-5x4-45A-copal-compur-0-fit-lens-board-110mm-square/373448559593?hash=item56f344cbe9:g:FJ8AAOSwGC9d5E9Iyou can unscrew the lens and check.
https://skgrimes.com/products/lens-board-mountings/#chart
perhaps a question for @mi7rennie .. I have a Fuji 150mm 5.6 4x5 lens, it has a seiko shutter, I need to get a Toyo board for it, how do I know which board?