Dating vintage Starrett tools

Another late question. I have what I've always considered to be a No. 97-8 level, stamped "L. S. Starrett, Athol, Mass". It does not have the cross level, just the one tube. The catalog I have, No. 28, probably in the 1970's, does not mention levels without the cross level.
Two Questions, Is this abnormal, or just old, and can I get a No. 98 tube for it?
 
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I have a 1957 catalog. Cover says Second Edition Catalog No. 27.
 

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