TBH, I don't think you need a new crystal, the crystal look good to me, just buy a Polywatch (crystal polisher) rub it circularly with micro fiber cloth for 10 to 15 minutes, your crystal will be good like new.
And your watchmaker is right, original signed crystal's design is unique and extremely hard to find. Just polish the crystal, it will save you from a lot of troubles.
Not that because you have a watch press, you would be successfully pressing in the crystal, it require skill and experience, a slightly misplace or unbalance will led to breaking your crystal
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