Standard Floor Loom: The serial number can be found in the middle of the cross piece under the harnesses at the front of the loom. On older looms, the serial number may be on the castle side.
After September 1987, the serial number is the date of assembly (mmddyy.)
FL4 – FL8 = 4 or 8 harnesses
FL4-4 = 4Now-4Later
HC or LC = High Castle or Low Castle
-C = Cherry wood
Up to 4-1256, there are 36″ and 42″ weaving width floor looms. After 4-1256 there are 36″ and 46″ widths.
Standard Floor Loom Serial Numbers
| Serial Number | Assembly Dates |
| Wooden harness channels:
1 through 243 248 through 450 |
Before May 1979 May 1979 – September 1979 |
| Metal harness channels:
4-1 through 4-117 8-1 through 8-69 |
September 1979 – January 1980 |
| 4-118 through 4-375
8-70 through 8-154 |
January 1980 – December 1980 |
| 4-376 through 4-730
8-155 through 8-239 |
January 1981 – December 1981 |
| 4-731 through 4-1083
8-240 through 8-330 |
January 1982- December 1982 |
| 4-1084 through 4-1525
8-331 through 8-428 |
January 1983 – December 1983 |
| 4-1526 through 4-1759
8-429 through 8-526 |
January 1984 – December 1984 |
| 4-1760 through 4-2035
8-527 through 8-617 |
January 1985 – December 1985 |
| 4-2036 through 4-2237
8-618 through 8-687 |
January 1986- December 1986 |
| 4-2238 through 4-2377
8-688 through 8-750 |
January 1987 – December 1987 |
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