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A Quuen #27 should be a two blade Barlow, steel will be stainless.
Either 440A or 440C.
2 blade Barlow it is. Hummm, now if I could figure out how old. Anyone have any info on how to date this knife?
Tang stamp has only
"PAT. NO."
"2728139"
blade has Queen Steel #27 etched on it.
It has a solid back with an opening at the front and back for the spring.
OK, In 1960, Queen stopped using tangstamps as a cost saving measure, and returned to using them around 1972, so that should put yours in that window.
BTW, is the main blade on this knife a Wharncliff or Sheepsfoot blade, with the second blade being a smaller Pen blade?