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Electronic components such as transformers, potentiometers, speakers, and some capacitors are often stamped with a date code, which indicates the manufacturer and the manufacturing date.The code follows the format: = a number from 1 - 52 indicating the week of manufacture.Some things are very obvious such as non-original or reconed speakers, non-original transformers, replaced pots, re-tweed, re-tolex, re-grill, etc.and these changes are often disclosed and of a non-malicious nature.

Looking at serial numbers next to the ’60 5G5 brown Pro Amp for example, we see numbers ranging from 00001 to 02000, suggesting that there are 2000 of these amplifiers made in ’60.This sticker is a chart that shows the types of tube types used and the order of their physical location in the amplifier, and may be rubber-stamped with two-letter date codes that denote the year (first letter) and month (second letter) of production.These stamped letters may appear in various positions on the chart.For example, EIA 606-4-21 would denote the 21st week of 1964.It is also advisable to add about 6 months to the date to allow for time these parts may have spent in inventory storage.Since several models can share one chassis type (for example, the early brown 5G7 Bandmaster, 5G5 Pro and 5G12 Concert), this kind of interpretation is inaccurate.

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