need some advice before purchasing a used Tudor Jumbo

[rmurphy]

I'm looking to buy a used Tudor Jumbo Oyster Date from the 80's ....... It's a stainless model with a gold fluted bezel and the crown is gold in color as well ...., what does it mean when he says the crown is not signed? Does it mean the watch is not worth buying? Or could I simply replace the crown and stem?
I hope it doesn't sound like a stupid question but I don't want to get myself into a situation where I'm stuck with the watch and I'm not happy with it, it looks great other than that, and priced right for a beater in my terms for a beater. I'm never hard on any of my watches but it does concern me when I see you all other Tudors with a signed Rolex crown and this one doesn't in the seller has even disclosed that he doesn't know if it's a replacement, every other one that I've looked at seems to at least have the Rolex signed crown and I've even seen some that look like it's Tudor shield crown but they might just be an optical illusion… :-)
Thanks for all your guys's help
Rich

PS. This was originally posted in the for sale section, maybe it was moved and if I'm posting this in the wrong section mods please delete, but I do need the forums advice.