Victorian pocket watch case pendant locket gold guilloche enamel landscape (7500)

Antique Victorian gold and enamel pendant locket / pocket watch case. Originally a pocket watch case, converted during the Victorian era to a locket pendant. Black and gold enamel and polychrome guilloche enamel. Almost certainly Swiss, made 19th century.   
 

Measurements: 

Weight is 8.6 grams. A tad over 1 inch in diameter (approximately 2.3cm). Approximately 5mm wide. Length of locket including the loop 1 1/2 inches (3.6cm). 

Description : 

An exquisitely enamelled round watch case, converted generations ago into a locket pendant. Both top and bottom are enamelled: the back/bottom is engraved gold with black enamel in a delicate floral design of flowers and foliage. A central boquet of mixed flowers surrounded by concentric rings of various finely depicted flowers. Exquisite detail. The combination of black and high carat gold is superb. 
The top/upper outer case continues the black and gold theme in the subtle, narrow border. This also indicates that the parts (top and bottom) were originally made together. Within the outer ring of black and gold is a superb guilloche enamel depiction of boats on a lake, mountains in the background and a few building over to one side. The color range is beautiful - pinks, oranges and blues of the sky and sea with the black and gold shimmering buildings echoing the black and gold of the previous sections. 
A glazed compartment contains a lock of hair. 
Usually, pocket watches had a 2nd section, but this case seems to be securely closed.
A ring allows a substantial chain to be attached to the case. 
Workmanship, as mentioned is excellent.   

Marks and Metal: 

The gold inside of the landscape has an engraved 1 and very lightly scratched numerals which were a previous owner's inventory number. It is almost certain that should there be a 2nd compartment, there would be a much fuller set of hallmarks, but we are not going to try to force it open. 
Gold was electronically tested. In general, the gold is 18k, but the bow (loop), where it needs extra strength is 10k. 
     

Condition: 

We found absolutely no wear, loss or damage anywhere on the enamel.  Please see enlarged pictures and don't hesitate to ask questions which we will do our best to answer.   

THE STORY: 

We will never know whether this case actually contained a pocket watch. The locket of hair is certainly very old and most likely dates to the 19th century.