Can someone help me figure out what year my Jeep Willy's is?

Livin the dream

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I have a 1941-1948 Jeep Willys and I have gotten so many numbers off of it, the engine, the Ca. assigned number, old insurance cards, etc. It was my Fathers and was willed to me and I have tried everything to get a correct VIN number and try to figure out if it is a military model and what year it is. Please help.........It is registered as a 1948 but I don't think that is correct according to the research I have done so far. Is there any Jeep experts out there who can help me?
The VIN # listed on the title is CA748921 but I don't think that is correct. I found other documentation with a VIN# of J209875?
The number on the engine is 4-30 CA 1027L W 10A N1-CR-N2?
Actually, the whole# is 4-30 641087-L-WIOA-NI-CR-N
 
There is a serial number on the frame rails in front of the grill, that should help, but they are serial numbers not a VIN. The number on the engine is probably not accurate because the same engines was made for different models
 
I'm not sure if this is how it was done in the 40's but now the 10th digit in the VIN indicates the year of production. If it's a letter then count which letter it is and apply that. Send me the VIN and I can look it up and get it decoded via the Hollander used auto parts system we use here at the salvage yard. It will tell where and when it was manufactured.
 
I'm not sure if this is how it was done in the 40's but now the 10th digit in the VIN indicates the year of production. If it's a letter then count which letter it is and apply that. Send me the VIN and I can look it up and get it decoded via the Hollander used auto parts system we use here at the salvage yard. It will tell where and when it was manufactured.
 
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