Very nice knife regardless, Harry. You have an outstanding display there, too. Very compelling to consider the comparative lines of that quartet.
I will give you some comparative pictures and some dimensions . If there is more that you want , let me know .
There are 4 in total . 2 Barlows , 1 Lambsfoot , and 1 Sheepsfoot .
Left to Right
#1 Barlow has 2 blades , Clip & Pen , Ox Horn Covers , Worked Back , Yr. 2014 and 3.45 Long
#2 Barlow has 1 Clip blade , Ramshorn covers and plain back , Yr. 2014 and 3.45 Long
#3 Is a Lambsfoot with 1 blade , Ramshorn covers , Worked back , Yr. 2017 and 3.6 Long
#4 Is a Sheepsfoot with 2 blades , Sheepsfoot and Pen , Jigged bone , and plain back , Yr. ??? and 3.69 Long

The Barlows have the Squared Off Ends

The Barlows handle Up-sweep is on the Blade side and the Lambsfoot and the Sheepsfoot handle up-sweep is on the back side . The Barlows handle up-sweep is also a little more abrupt meaning that it starts farther away from the pivot end .

Handle thickness picture is hard to tell that the 2 blade Barlow is the actual thicker of the 4 . Left to Right /// .67 /// .67 /// .63 /// .72
Now Right to Left :It is a little hard to tell with this picture , but all blades are centered pretty well , even the Old Sheepsfoot . The Barlows have Brass Pins and Liners and the Lambsfoot and Sheepsfoot have Steel Pins and Liners .

Main Blades only :
Over-all Length : Barlows = 6.09 /// Lambsfoot = 6.32 /// Sheepsfoot = 6.32
Blade Length : Barlows = 2.62 /// Lambsfoot = 2.75 /// Sheepsfoot = 2.62
Cutting Edge : Barlows = 2.19 /// Lambsfoot = 2.45 /// Sheespfoot = 2.38

This is just a very subjective measurement or opinion .
Most Comfortable in the hand when making a Cut with the Blade Turned Away from me . # 1 = Old Sheepsfoot then Lambsfoot .
Harry