aunque la letra L no se aprecia en la palabra WA THAM, seguro que es culpa de la foto y si que dice WALTHAM, manufactura del calibre o fabricante de la máquina. Te dejo un enlace donde podrás cotejar el numero con la fecha de fabricación y además si accedes al tramo 12 size y haces clic en view movements, se te abren las imágenes de los calibres.
https://www.watchrepair.cc/waltham-pocket-watch-repair.html. Si el tuyo es de 12 size o un diametro aprox. de 39 mm. allí estará. Ejemplo
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Fig. 1
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Waltham 1894 hunter[/SIZE]
Features
stem wind and set
sub second
Data
12 size, Dm= 38.8mm, Do= 39.8mm
H= 5.2mm
(dial collar +0.8mm)
F= -0.2mm
(mounting flange higher than dial plane)
T= 3.5mm
7-23 jewels
f = 18000 A/h
power reserve 42h
Balance staff U1803
Mainspring / battery
1.70 x 15.5 x 0.17mm
Hands
1.50 x 0.80 / 0.18mm
Comments about the data[/TD]
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Remarks
1894-1931
hunter calibre
bimetallic screw balance, Breguet hairspring
entry grades with brass escape wheel
in higher grades steel escape wheel, balance with 4 adjustment screws, minute wheel or complete train pink gold
negative stem mechanism (US market)
By pulling a hook near the stem also the uncased movement can be switched to winding.
attention: right handed crown-wheel screw
Grades:
(P.R.: patent regulator with regulation gear)
No.210: 7 jewels, pin set
No.210: 7 jewels
No.220: 15 jewels, pin set, optional P.R.
No.220: 15 jewels, P.R.
No.225: 17 jewels, P.R.
No.230: 17 jewels, P.R., adj.
No.235: 17 jewels, P.R., adj.
No.240: 17 jewels, pin set, P.R., adj.
No.250: 17 jewels, pin set, P.R., adj. positions
Am.W.Co.: 11 jewels, pin set
Am.W.Co.: 11 jewels
A.W.Co.: 7-11 jewels, pin set
A.W.Co.: 11 jewels, P.R.
Bond Street: 11 jewels
Bond Street: 15 jewels, P.R.
Bridge: 19-23 jewels, P.R., adj. positions
Bridge M.: 21-23 jewels, P.R., adj. positions
Duke: 15 jewels
Export: 15 jewels, optional P.R.
Maximua: 21 jewels, pin set, P.R., adj. positions
Maximua: 21-23 jewels, P.R., adj. positions
Riverside: 17-19 jewels, pin set, P.R., adj. positions
Riverside: 18-21 jewels, P.R., adj. positions
Royal: 15.17 jewels, pin set, P.R., adj.
Royal: 15-19 jewels, P.R., adj.
Sol.: 7 jewels
Special: 7-17 jewels
Example, year: signature; shock device
1914: 19985176, A.W.W.Co Waltham Mass., 17 Jewels - 985176
(No.225)[/TD]
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