Compiled from: 
http://www.chainsawcollectors.se/phpbb3/viewtopic.php?f=48&t=2927
http://www.chainsawcollectors.se/phpbb3/viewtopic.php?f=78&t=17591

[b][u]Model 1200B Timberhog[/u][/b]

001965, 1200B, mercurymike (McCulloch engine SN)
38049 Reed-Prentice Timberhog chainsaw, 1200B, "earliest known serial number"
[url=http://www.chainsawcollectors.se/phpbb3/viewtopic.php?p=247691#p247691]38736, 1200B, McC engine tag 1736[/url]
38949, 351-23000,  Tom Hawkins
[url=http://www.chainsawcollectors.se/phpbb3/viewtopic.php?f=137&t=26373]39378, 1200B, robert e malcolm[/url] 
39433, 1200B, randys
39494, 1200B, randys
41080, 1200B (1466), Tom Hawkins (?)
41148, 1200B, cliff
41178  1200B, engine SN 000778 Old Mac Guy
43944, 1200B (000733), Wayne Sutton
45201U Reed-Prentice Timberhog chainsaw, (11858) huck01955
45219, Tom Hawkins
U45615, mercurymike
46059, 1200B, Guy
46300, 1200B, knucklehead
47334, 1200B, saw hoarder
48395, 1200B, Magnus
48430, 351-23011, Ltractorman
48944 1200B Saw Hoarder
49162, Reed-Prentice, saw hoarder 
49383, 1200B, knucklehead
[url=http://www.chainsawcollectors.se/phpbb3/viewtopic.php?p=164425#p164425]49760 oregun[/url]
[url=http://www.chainsawcollectors.se/phpbb3/viewtopic.php?p=163288#p163288]50110  Cliff[/url]
[url=http://www.chainsawcollectors.se/phpbb3/viewtopic.php?f=278&t=19440]50168, Ltractorman[/url]
51090R, 351-r24600, mercurymike 
50697, 1200B, Tckarger	
[url=http://www.chainsawcollectors.se/phpbb3/viewtopic.php?p=182127#p182127]51105, 1200 dajn[/url]
52656, 1200, saw hoarder
53314R, 351.24600, Wayne Sutton
53550, 1200B, Norsk Skogmuseum
53881, 1200B, Norwegian collector
53903, 1200B, Ståle Grø
53911, 1200B, Ståle Grø
54051, mercurymike 
54114, Old Mac Guy
[url=http://www.chainsawcollectors.se/phpbb3/viewtopic.php?p=155298#p155298]54838 351-24600 Oddvars vacation project[/url]
55123, 1200B, Norwegian collector
55378, mercurymike 
57416, 1200B , Lewis Brander 
57416, Tom Hawkins
57538, 351 24600, Wayne Sutton
57758, 1200B, saw hoarder
57780, 122B, Internet
58212, 1200, saw hoarder
60736, 1200B, thelinntractor
?2477, knucklehead

[b][u]Model 50[/u][/b]
50 1121, Oddvar
[url=http://www.chainsawcollectors.se/phpbb3/viewtopic.php?p=14753#p14753]50 1224, Old Mac Guy[/url]
50 1406, Wayne Sutton
50 1557  Sawmaster007
50 4383, 351-50000, mercurymike 
50 4760 saw hoarder (Reed-Prentice, red Craftsman)
[url=http://www.chainsawcollectors.se/phpbb3/viewtopic.php?p=272067#p272067]50 4952, 2742[/url] 
50 4976, Wayne 
50 5212, Cliff
50 5291, 351.50110, jeffsanfilippo