I found the follwing info about inspection tag codes on a strat site:

The main model codes (first two-digits) found in the 1970's are:

01 Precision Bass and Jazzmaster
02 Jazz Bass
03 Telecaster Bass
04 Mustang Bass
05 Bass VI and Jaguar
06 Bass V
07 Musicmaster Bass and Telecaster Custom (second variant)
08 Telecaster Deluxe
09 Stratocaster
13 Telecaster Standard
14 Telecasteer Custom (first Variant)
30 Telecaster Thinline
40 Bronco and Starcaster
45 Musicmaster
49 Mustang
50 Custom/Maverick

The principle codes for the second pair of digits are:

00 standard finish with a rosewood fretboard
01 custom finish with a rosewood fretboard
02 standard finish with a maple neck
03 custom finish with a maple neck
20 left-handed with standard finish and R/W board
21 left-handed with custom finish and R/W board
22 left-handed with standard finish and maple neck
23 left-handed with custom finish and maple neck

So your middle 4 digits seem to suggest it's a maple neck Strat with a Custom finish. I bet you have a rosewood sunburst

The remaining digits could be the date i.e

11 521 could be 21st Nov 1975

My tag came from a 1972 P Bass. the numbers are 18 01 02 5.

The "02" is handwritten. According to above info "01" is a P Bass but this is specified as the first 2 digits.

Anybody shed any other info on these codes. Here's a photo f my tag:
[img]http://members.ox.net/goalie27/pbit.jpg]

[img]http://members.cox.net/goalie27/pbit.jpg]

I've posted images before what am i doing wrong? Can't spell either! Inspection ag is supposed to be inspection TAG!