So, being both bored and curious, I went through GEC's production numbers. Below is a (hopefully complete) list of patterns made under the GEC brand each year. I generally didn't include marked SFOs except the 2009 jack because I own one and know it exists as the only jack. To my knowledge, all the folding blades under GEC have been stainless but the fixed blades can be stainless or carbon depending on the model and year. I included the steel type if different than 440C if I own one and could confirm it wasn't 440C. In general, if a blade has the 'Cyclops' or 'Cyclops Steel Works' marking then it was 440C (Titusville Iron Works or TIW is generally used for 1095). They may have changed the stampings since 2014, I'm not really sure. My 2014 H10 is marked '440CSS' instead of 'Cyclops'. I believe the majority of the fixed blades are 1095 instead of stainless.
Single bladed
2008 - #73
2009 - #23
2010 - #12
2010 - #25
2012 - #48
2014 - #47
2015 - #63
2016 - #15
2016 - #74
Two bladed jack
2009 - #73 for Cripple Creek with 420hc
Full double bladed
2006 - #73
2006 - #23
2007 - #73
2007 - #23
2008 - #73
2008 - #23
2009 - #73
2010 - #53
2011 - #73HP
2012 - #48
2012 - #73
2013 - #73HP
2013 - #65F (420HC)
2014 - #48B
2015 - #63F
Three bladed
2008 - #53
Opposite end full bladed configuration
2008 - #53
2010 - #53
Opposite end pen configuration
2011 - #33
2011 - #61
2012 - #68
2012 - #89
2013 - #62
Lockback
2011 - #72
2014 - #42
2018 - #99
Fixed blade (not all confirmed as some have been made in 1095 under the GEC brand)
2007 - #50
2007 - #60
2009 - #10
2009 - #50
2009 - #60
2010 - #50
2010 - #60
2010 - #H23 (1095)
2010 - #H73
2011 - #23
2011 - #H73 (1095)
2012 - #H10
2012 - #H23 (1095)
2012 - #H73 (1095)
2014 - #H10 (1095 and 440C)
2014 - #H20
2015 - #H50
2015 - #H60
2015 - #F905/6 (420HC)
2016 - #H10
2016 - #H73
2018 - #H20
HP = Hoof Pick, F = Fish knife with scaler blade, B = Bird knife with gut hook.