The attached pic of four vintage Pacific reloading presses from their introduction in 1928 through the early 1970's when, following a series acquisitions and relocations, the name was acquired by the Hornady Co. Developed and patented by the Pacific Guin Sight Co. of San Francisco, Ca. in 1928 the Pacific "C" was a game changer as it rendered most other types of reloading tools obsolete vitrually overnight, with its "C" configuration becaming the most copied style in reloading history. Other Pacific innovations such as its simple priming arm became the interchangeable industry standard, and still is. Another Pacific "standard" which all handloaders should be thankful are 7/8" screw-in reloading dies. Same with other conveniences we take for granted such as auto priming feed. Post WWII Pacific presses were painted blue and featured integral auto-primer feed adapt, but still operated on up-stroke only.
Which changed in a final tool design, which could be operated up or down stroke. The other pic shows my very first reloading tool which I bought in back in 1950 when I was 14, and as now mounted on wall in my reloading room. It still looks and works almost new even after uncounted thousands of reloads because I take good care of my equipment.
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In the 2 photos is my minion using my RS3 by RCBS to full length size some .223 brass. To his left is an RCBS Special 5 press and at the farthest left of him is a Lee challenger O press that doesn't require the bushings it is threaded for standard dies. This photo was taken in March of this year when it was a rainy day and I was recovering from my cancer surgery and on chemo therapy during that time.
, but I use it mainly for the taper crimp die. I make the shells on the 600, and slip the finished shell into the first station of the 650, run the plate back one station to the taper crimp, then back out. 
