Bianchi Serial Number Location

I just purchased a 1970 Schwinn Racer at a local swapmeet this week. Before buying the bike I noticed the serial number on the rear dropout and it was a LF*****. When I brought it home and did a quick rinse with the water hose to remove dust I noticed another serial number on the head tube with MF*****. Both serial numbers are different. There are no re weld marks so I'm sure this is factory. Has anybody ever seen or heard about anything like this? Do I have a one of kind or was this done often.

BICYCLE SERIAL NUMBER LOCATONS. BIANCHI-3 OR NONE. Evidently Bianchi serial numbers are very difficult to decipher. There is a Bianchi serial number ID thread on the Classic and Vintage forum at bikeforums.net that is frequented by a few very knowledgeable people- I would post this query there.

First time I've ever seen something like this and have had atleast 200+ Schwinns pass thru my hands over the years. Welcome to the forum. I moved your topic here because it will get more exposure to help answer your question. I've never seen the oddity in your bike's serial numbers before but it sure is a cool topic for discussion.

Charlie who is a Schwinn bike dealer and an astute collector may have seen or heard of this before. I do however suspect that Tad may be close to the answer that Schwinn began it's new serial number location for 1970 on the headtube and since that is the later date just as in book publishing, the later date is probably the date it was assembled. My display driver keeps crashing windows 7. It is unusal and definitely not a standard practice. Pictures tell a thousands words they say.

Mistakes on records, at least, do add to their value, at least a little bit. Somewhere around here I have a Nat King Cole record with some rather obvious typo on it -- I can't recall at this moment what the printing mistake was, but I discreetly grabbed it for a buck or two when I found it at an estate sale, and one of these days when I get around to selling this little pile of vintage albums, I'm going to make prominent mention of that. If you sell that bike, you should do the same. (My entirely unscientific guess is that they batched up a whole run of frames, then restamped each on the headset with the appropriate month prefix when each unit was completed.).