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If this is indeed one of the last 9838s, it seems odd that your horn has the older-style Simplex label instead of the newer label (such as the one on https://www.ebay.com/itm/Simplex-2901-9838-Fire-Alarm-Horn/142847053294?hash=item2142590dee%3Ag%3Aoo0AAOSwU3VbNH0f&_sacat=0&_nkw=simplex+9838&_from=R40&rt=nc&_trksid=p2047675.m570.l1313.TR0.TRC0.A0.H0.Xsimplex+9838.TRS1 this 9838). This, along with the fact that the current draw listed on your horn’s label does not appear to match that of any of the newer Faraday horns, points to the possibility that it has perhaps been mislabeled or altered.
I’m not sure about the discontinuation date for the US-market 9838, but its Canadian counterpart, the 12901-9801, seems to have been available as late as 2000, as evidenced by the date listed on https://simplex-fire.com/en/us/DocumentsandMedia/S12901-0002-2.PDF this datasheet. I’ve always assumed that the 9838 was discontinued in the mid '90s in the US (around the time Simplex introduced its “rectangular” 4901/4903-series signals). I wouldn’t be surprised if these horns had been kept in production exclusively for the Canadian market after being discontinued in the States since Simplex never sold its “rectangular” signals north of the border, leaving them (as far as I know) with no other ULC listed offerings in the category of horns during the late '90s.