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Canon 7d serial number11/12/2023 Newer examples have long (10-digit) serial numbers and no date codes. Older examples have short (6-digit) serial numbers and date codes. The EF 70-200mm f/2.8 L IS II USM is an interesting and possibly unique case. ![]() So for example the EF 70-300mm f/4-5.6 L IS USM and the 1.4x and 2x Mk III Extenders have 10-digit serial numbers but no date code. However, new designs introduced since then have longer (10-digit) serial numbers and no date codes. Up until about 1½-2 years ago all "L" series lenses and some other lenses (TS-E and MP-E lenses, and Extenders) had date codes. All lenses have serial numbers (which on Canon lenses are 5- to 10-digit numeric), and in addition some have date codes. ![]() ![]() As da_nige says, these things like UT0308 aren't serial numbers, they're date codes.
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