This appears to be a Spode bone china London shape Coffee Cup of c1814 but the Spode Museum Trust cannot find a record for this particular design. Tantalisingly I can find a matching Spode Armorial Dessert Plate online but no mention of a pattern number for this design, here is a link to it: https://www.worthpoint.com/worthopedia/spode-armorial-dessert-plate-c1805-10-245001660 If you have any information regarding this pattern both myself & the Spode Museum Trust would be very interested to learn about it.
I have seen a Coalport cup & saucer decorated in this same pattern for sale on Ebay (October 2019) so it was possibly a Coalport pattern. If Spode produced my cup as a Coalport replacement piece I would be surprised that they had used a Spode London shape handle rather than a Coalport one because this was not their normal practice.
A very similar gilt scrolling pattern was used by Spode together with this inner gilt leaf band on their pattern number 2352. A remarkable Spode Tea & Coffee Service in this pattern 2352, decorated in azure blue & mauve enamels together with gilt was ordered & destined for the Imperial Court at St Petersburg, Russia; although it did not reach its intended destination due to the after effects of the Napoleonic Wars which resulted in the Norwegian-Swedish War of 1814. Background information to the Norwegian-Swedish War here: http://www.napoleon-series.org/military/battles/1814/c_norway1814.html
The ship which was carrying this precious order was captured & taken to Christiansand, on the southern coast of Norway where the contents of it including this Spode Service was sold. Russian Consul General, Brunett bought the Spode bone china service and gave it to a Norwegian lady, Henrietta Rosenkilde who was engaged at the time to be married to Jens Edward Kraft. Their descendants have lovingly preserved it ever-since as one of the family's most treasured possessions & it was owned in 1978 by Mrs Molla Kraft, of Oslo.
This pattern 2352 service (black & white photograph only) can be seen illustrated (271) in Leonard Whiter's book 'Spode' together with its matching 'Egg' shaped Coffee Pot.
The handle on my London shape Coffee Cup looks like a Josiah Spode II handle in its form & with its distinctive gilding pattern running down its length.
If anyone has a matching Saucer or other matching piece of Spode bone china which is marked to its base then obviously I would be very interested to hear from you.
A few very tiny specks of kiln dust which is very usual to early Spode bone china but I'm just being very picky, actually this is in fantastic condition & by 1814 Spode had mastered bone china production.
But unmarked to its base, so no clues as to its pattern number.