Restoration of a limited edition (500) Prestons Waltham Junior (1918) - 16s 15j Model 1899 Grade 621

Service of Prestons Waltham Junior pocket watch, size 16, 15j, hunter case, model 1899, grade 621, Breguet overcoil and the run quantity was 500.
This Waltham pocket watch was produced in around 1918 for Prestons of Bolton, a jeweller store in the North West England.
A new old stock mainspring for Waltham 2227 was fine, however after 24 hours of running the timing was going downhill and when I disassembled the barrel the 2227 mainspring was set.
A new GR6978TR mainspring had to be modified to fit the Waltham barrel. The lid (called the main wheel) is separated from the barrel (called the lower portion or shell) and the main wheel is staked to the arbour hook.
The mainspring modification is required, otherwise when the barrel is near full wind, the hole end would release from the barrel hook.
As always, majority of the work is recorded under a macro lens.

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Leo
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Timestamps:
00:00 Intro
02:05 Bezel
03:00 Hands
04:07 Power release
04:23 Movement removal
04:48 Dust Band
05:14 Dial
05:44 Motion Work (Part 1)
06:24 Balance
07:01 Motion Work (Part 2)
07:49 Pallet Bridge and Fork
08:32 Barrel Bridge
10:07 Train Bridge
11:02 Keyless Work
13:02 Barrel
15:41 Balance cleaning and oiling
17:26 Pegging out
18:30 Keyless Work Assembly
22:14 Train Bridge overview
22:23 Mainspring selection
23:36 Mainspring modification
25:16 Mainspring cleaning and lubrication
26:55 K&D Winder and Barrel assembly
29:35 Train Bridge
32:41 Barrel Bridge
38:00 Mainspring testing
40:26 Oiling
43:02 Pallet Bridge and Fork
43:51 Balance
45:17 Lift angle
46:17 Timegrapher
47:49 Motion Work
48:55 Dial
49:40 Dust Band
50:00 Hands
53:20 Casing
54:10 Acrylic glass
55:11 Ending & Eye Candy footage