[VFB] question on hooks??

[GGFlyTyer]

I've been fortunate enough to be doing some work for a widow of an old fly tyer. We agreed to make payment to me in trade rather then money and I was given his hook collection. Most of these I already had (the Mustads anyway) One question involves the mustad 9174 which is the number I've had on my boxes in sizes 4 and 8 they are "egg hooks", he had a box of hooks numbered 9471 #12's called "spider hooks" they look exactly the same except smaller. So my question is does anyone know which number it should be 9174 or 9471?   Next (and this is new to me if the numbers are right) he also had Tiemco hooks number 102Y in sizes 15,16 and 17. Could those sizes be right? I didn't realize hooks came in odd number sizes, or were these just marked wrong?   Thanks for any info on these questions, Ray Gattus Sr.   BTW,  I'm reading the new FlyTyer magazine and it has an article on picture framing your favorite flies which I am working on now from all the "Grey Ghosts" that were sent to me!