Hawthorne serial number

[Fv2]

Ok, So I have a hawthorne frame I bought in Portland In. last year. There's no serial number that I can find, just a 3 digit engraving on the bottom bracket...Looks like 168, any one have any ideads ????

IMG_0036 by falstaff_1, on Flickr

IMG_0037 by falstaff_1, on Flickr

 

[roadmaster]

late 30's to late 40's would be my only guess, but that is probably obvious. Nice frame though

 

[Fv2]

Thanks, I have future plans for it.