Varvill & Sons was one of the UK planemaker most active between the late 800 and early 900.
This smoother plane was built likelihood in the last two decades of the nineteenth century. It has a metal sole and a rear handle, screwed into the back of the body. Hard to say if the metal parts are original or homemade, though some rough details lead more to the latter option. The plane conditions were quite good; this allowed the easy repair and tune up. The beech handle had a break at the top, which occurred where a knot was present. 
I removed the broken part and replaced it with a new piece of same wood, then colored like to the old beech. The metal sole was slightly bowed in the length, probably due to the wood movement. I removed the screws and smoothed the wood with another plane. After installing the metallic sole, I corrected it on sandpaper attached to a flat surface. Another issue concerned the mouth width. Almost 2 mm, definitely too much for a smoother. I therefore decided to reduce the opening by inserting a couple of veneer pieces on the seat. I sharpened the blade with a 30° secondary bevel, flat edge profile, blunt on both sides.
The first point seems irrefutable. For the second one is necessary to say that the presence of the metal sole prevents natural wood movements and can easily lead to cracks in the plane body, and it is not flexible enough to prevent any warping especially along its length.
I removed the broken part and replaced it with a new piece of same wood, then colored like to the old beech. The metal sole was slightly bowed in the length, probably due to the wood movement. I removed the screws and smoothed the wood with another plane. After installing the metallic sole, I corrected it on sandpaper attached to a flat surface. Another issue concerned the mouth width. Almost 2 mm, definitely too much for a smoother. I therefore decided to reduce the opening by inserting a couple of veneer pieces on the seat. I sharpened the blade with a 30° secondary bevel, flat edge profile, blunt on both sides.The plane works fine but I have some general concerns regarding its hybrid structure.
The metal sole is not as great in the smoothness as wood, but is certainly an advantage for two reasons:
1) It adds weight to the plane, useful for cutting with very little iron.
2) The sole resists to the wear and has not need of frequent maintenance.
The first point seems irrefutable. For the second one is necessary to say that the presence of the metal sole prevents natural wood movements and can easily lead to cracks in the plane body, and it is not flexible enough to prevent any warping especially along its length. If planing the underlying wood is a solution to restore the flatness, the wooden mouth increases its amplitude and the opening for the chips will be larger. But even if this does not happens, you have to deal with the tapered blade profile, so that when it is sharpened it decreases its thickness still leads to a wider mouth. In a full wooden plane a larger mouth is repaired by placing a patch to restore the exact opening width. This is not easily possible with a metallic sole. The repair done with shims placed on the seat can slightly alter a perfect wedge insertion. Even the handle has advantages and disadvantages. The advantage is a comfortable grip, but at the same time it is an obstacle to beat with a mallet on the plane back when you have to remove the cutting unit. One is inclined to beat on the handle and perhaps this was the cause of its break.
The hole for chips ejection can be easily achieved with a Forstner bit. The body design is very close to the original and I must say that the fingers have a perfect support.
Having only one side useful for working you have to build two twin planes, each working in one direction. One use for wich I found convenient is to finish the rabbets. In this one, made with the circular saw, I screwed the setting of the blade and the result was a visible residual step. A simple job for one of the little twins!
Moreover, some tool dealers commit their planes to Stanley. This was the case of Simmons (St. Louis). He since 1866 marked his best made tools "Keen Kutter", a mark kept in use up to 40. I know two Keen Kutter plane series. One has letter K engraved on the plane body and is similar to early Stanley Bedrock planes, the other has engraved letters KK and was like to Sargent planes, and probably made by (I thank Mike Hamilton for giving me more info about Keen Kutter planes). 
The blade is a "Two Cherries" tapered blade, having a 4 mm of thickness at cutting edge, far more than an ordinary Stanley type blade.
