On Sun, 18 Mar 2007 15:38:07 CST, Rick wrote:

Somewhere along the way that got changed so that the prefix is now
inserted ahead of the call sign instead of after, e.g. "W1/G5ABC".

When did that rule change go into effect?

That change went into effect with the Commission's Order FCC 98-204
released October 1, 1988 in WT Docket 98-20, setting up the ULS and
authorized CEPT and CITEL foreign licensed amateurs to operate in the
US without formal US reciprocal licensing.
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73 de K2ASP - Phil Kane
ARRL Volunteer Counsel

email: k2asp [at] arrl [dot] net