I bought my first 45 in 1963 (Little Stevie Wonder's "Fingertips" on Tamla — 98c at the A&P!), but only really began seriously collecting records since 1967.
I have a wide range of collecting interests ... have a look at my lists: 45cat / 45worlds.
The numerical listing in Michel Ruppli's discography, The Capitol Singles, has the sides for Capitol 1657 and 1658 swapped, which apparently escaped the proofreader's notice.
Going through 1948 issues, Billboard was still using "Race" in its 'Reviews' and 'Advance Record Releases' lists. RCA Victor used either "Rhythm & Blues" or "Blues" in it advertisements.