I use black tape with Tippex dots. The tape came from Amazon and is reasonably robust at least on my bass guitars (defrets, so the existing dots are in silly places). Unfortunately the Amazon search is so rubbish that I can't find it even though I already bought some and they are keen to sell repeat orders.
Not something I've heard of before. Condition is interesting, but I quite like the way it's been patched up.
Antoria "Twin Caster" semi-acoustic, 1966.
https://www.ebay.co.uk/itm/134818165857?hash=item1f63c9f461:g:viUAAOSwtytlW9WJ
It occurs to me that some Japanese bassists might be ... slightly odd.
I suppose it would at least teach you to play it without looking at it.
https://www.ebay.co.uk/itm/295988147599?hash=item44ea44b58f:g:oZQAAOSwNEFlK3aJ
I bought some pickups from Paddy. He went out of his way to get them posted quickly and all went smoothly. I'd be pleased to deal with him again. Thanks Paddy