Tuesday, October 13, 2009

Dating Vintage: Using RN Numbers

Ok, we don't plan to write very often about math formulas, but I thought this was pretty useful. While trying to figure out how old a shirt is, I came across this eBay guide on dating clothing via RN, WPL and CA numbers on clothing labels.

The FTC issues registered identification numbers or RNs to businesses residing in the US that are engaged in the manufacture, importing, distribution, or sale of textile, wool, or fur products (note that not all of these types of companies are issued RNs). Starting in 1959, the first number in the series was 13670, and since then there were an average of 2635 RNs per year.

So, while it’s not absolutely precise, you can estimate the earliest date a garment could have been produced with the following formula:

Your RN #
-13670 (first RN # in series)
Total #s between the original and yours/2635 (average #s issued per year) = # of years since issue date
1959 + # of years since issue date = estimated year of issue

For example, I used the formula with the this shirt:


The RN #: 55749
- 13670
= 42079
Divided by 2635
= 16 (The # of years since the issue date)
1959 + 16
= 1975












Therefore, the RN number for LAX, the maker of this shirt, was issued in 1975. This doesn’t mean the shirt was made in 1975, just that the this is the earliest date when it could have been made. Thus, it isn't from the 1960s, for example, though it is possible it is from the 1980s. To figure out a more precise dating on the shirt I would need to use other clues, such as the style, logos, company history, or union tags.

26 comments:

  1. ok got a question. a gap jacket made in usa with an rn of 15524. I am stumped. the formula does NOT work. I THINK I bought it in the 80s so how do I figure this one out??

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    Replies
    1. The rn number only tells you the EARLIEST year your garment could be made. The GAP RN number calculates to about 1960, (if memory serves me correctly)that is the earliest your garment could have been made or it could have been made much later, as you stated you purchased in the 1980s

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  2. is it possible Hayes Garment in Nashville made these for Gap? I found an RN database that says hayes...and they made clothing western wear etc but were merged with another co called genesco. trying to determine age for selling this item. lotta work.

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  3. The RN number can only show you the oldest the item could be. For example a bandana with rn 13962 could be as old as 1959 or could have been made much sooner.

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  4. I have a Charter Club dress that has a wpl 8046 label. it's blue with light blue flowers and the tag says it's 100% cotton. I read that wpl numbers were only assigned from 1941-1959, but Charter Club seems like a more modern label. How old is it?

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  7. The RN number on a label only shows the earliest date production started on that particular style or pattern. They then could have gone on to produce that exact items style for 20 years or more.

    ReplyDelete
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  9. Hello i have a parka with and RN number as follows RN 94 2183906 - seven numbers not five. Which doesnt work in the RN database.
    any ideas? It shouyld be a 1970s make...thanks!

    ReplyDelete
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