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These aren't difficult movements to service and repair, and parts are plentiful, so any competent vintage specialist will be able to service it. Needs a blob of lume at 11 o'clock too.
Original crystals are very rare and expensive, and the replicas are not a perfect match, so get the existing crystal polished instead.
watchguy.co.uk do a great job and turn things around quickly. And the Seiko gurus below are all very competent in my opinion
@rexworthywatches,
thewatchbloke.co.uk
thewatchspotblog.com
I would give this to whoever can turn it around quickly as some of these guys have long wait lists.