GEORGE LEE AND SONS 20TH CENTURY MARK 1 SEXTANT BY OF PORTSMOUTH ?

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GEORGE LEE AND SONS 20TH CENTURY MARK 1 SEXTANT BY  OF PORTSMOUTH ?
This is the best info I could find online,but not positive of exact details.
Guys are asking me to list the rest of my 10-15 sextants,so here we go.
Please ask questions,and I will do my best to answer.
I think I have 10 similar sextants that I will be listing soon.
This beautiful piece came in a 10,000 piece consignment of antique marine items that I just picked up.
I see these on Ebay going for up to 00.00.
I am a coin dealer,and know nothing about Marine items, but I am learning every day.
I will be listing items every day.
If you have questions about this item,or other items I will be listing,please email or call.
I have added 5 pictures of I items that I will be listing soon.
Local pickup always best to avoid damage in shipping.
If anyone out there knows more about this cool piece,please let me know.
Thanks,
Larry Shapiro
310 710 2869
Lashap at cox net