D4 7U Blade (First post)

I have a blade question
It's got the no. 31 L 91 stamped on it twice ie in two locations .
Is this the serial No. as I need to get new cutting edges and blade bar it .
It measures 9 ft across the top of the blade. Can any one help!

Those numbers aren't whats needed.
To be approx 9 ft that would be an angle blade and have the following serial number (started out on tag on RH rear of mold board but is probably long gone.....sometimes they were stamped at the tag location) 6F1001 - 6F11299 uses a current 1J16 part number for the main cutting edge and 6F11300 - up and 52E1 - up uses a 2J469.
Both use the same RH end bit 1J127 and LH 1J128 ( these are six bolt bits)

If you can't find any usable blade serial numbers, check the end castings of the hydraulic lift cylinders for casting numbers....sometimes the blade can be back checked through the early and late cylinders.....if they haven't been changed.

More info....this should help with ID
The 6F1001 - 6F11299 uses 23 bolts on the main cutting edge. The other uses 17.

Thanks very much OM , You are spot on Those No. s I found are probably a
Govt No. as it used to be roads board dozer.
I found our blade book today. Thought I d lost it. Put away so well I could nt
find it. However Its the blade with 29 bolts plus three at either end too that makes 29nall up. Should be able to work this out now . Thanks once again for your help.I now have the complete set of books etc for the D4 7U its serilal No. being
7U 40767.When I get fial drive seal fixed and the rest back together and she has had a birthday ie oils & filters done, seals in hydrualics etc etc will post some photos .