Help identify a Tudor.

[Trophy200]

Unearthed this nice looking Tudor wristwatch complete with original box and guarantee certificate dated 1958 in a friend's house this last weekend.
There's no intention to sell it but I thought I'd ask if any enthusiasts on here could identify the model.
It appears to be working but not had a chance to check accuracy yet. It's a manual winder.
Any ideas on potential value for insurance?
Thanks.
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[Lee540]

Can you remove the case back? I've not seen one the same as this but have seen similar. £400-800 range.

[nikaiyo2]

Looks 50s to me, likely solid 9ct gold case, if so the movement will be Tudor, in a case made in the U.K. not sure if there is a “model” as such I think jewellers would just buy a movement and case it themselves. I think it will be an old ETA 15 Jewel movement, maybe an A Schlid

They are very small for a mans watch and a bit dower for a ladies watch. Value wise, maybe £700-£800 replacement, maybe get £250-£300 if sold.

[Trophy200]

Thanks for the responses.

I'll try and get a photo inside the case for more clues.

Trophy200