Welcome Dooly!
Nicely done on photos and showing the progression of your restoration work, which is outstanding and thank you for giving these worn old weapons the chance they deserve to be properly preserved.
The dealer you observed was clearly 'working it!' and I'm glad you got this instead of him
The acid etched script on the barrel is Islamic calligraphy known as 'thuluth' and seen characteristically in the Sudan on weapons during the Mahdiyya period in the latter 19th century. This was also known in Ottoman regions in Egypt and others in degree, though it had been largely been superceded elsewhere in Islamic inscriptions of Qur'anic verse by the Naskhi script.
This appears to be a trade produced flintlock made in the English style and the pistol is mounted in a style which appears much in Balkan style with the sharply angled neck and butt. These were often produced for native consumption , and these type guns were entering Cairo centers, often cheaply made in Leige in the 1870s or so. Apparantly mostly muskets were coming in, but it would seem flintlock pistols did as well in some degree.
The thuluth etching on this barrel suggests the pistol may have been handled during Mahdiyya times (c. 1884-1898) but as these were not commonly used by these forces, it is possible this may have been a special case issue or award.
The absence of the ramrod suggests also Ottoman style in the gun, as with them their pistols' ramrods (suma) were carried on belts.
Probably some interesting history with this one, and quite possibly some intriguing potential as a weapon from Egypt or the Sudan end of the 19th century.
References:
"Firearms of the Islamic World" Robert Elgood, London, 1995, p.224
Other good references regarding the British military pistols;
"British Military Pistols" Robert E. Brooker, 1978
I hope you will be restoring the stock from illustrations of the original as these trade anomalies were by no means standard, and it would be good to see this one kept faithful to the original. The locks were simply copies of the British ones, which were often reused of course.
Your work on the weapon as shown to date is superb!!!
All the best,
Jim