Stanley No. 99 Side Rabbet Plane
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Stanley No. 99 Side Rabbet Plane (Type I)4
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1923 Catalog Image of No 99 Side Rabbet Plane2
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Justus Traut's 1/29/1895 Patent Date Stamped on Type 1 Skate4
 Features1: Left handed, detachable and reversible nose piece.
Patent1: Justus Traut's 1/29/1895 (basic design)
Manufactured1: 1896 to 1942
Dimensions1: 4 inches long
Cutter1: 1/2 inch wide
Construction1: Cast iron, rosewood knob
Finish1: Nickel plated
User info1: A very handy plane for the left handed side of rabbet work. Fitted with a reversible nose for bull nose work, this plane is preferred by many woodworkers over the No. 79.
Average Price1: $50 to $150
Notes1:
Type 1 (1896 to 1906) Patent date 1/29/1895 stamped on skate and no provision for depth stops. Stanley TM cast in an oval border; model number cast in small type in square border. 
Type 1a (1907 to 1909) Same as above but now with "T" TM on cutters.
Type 2 (1909 to 1921) "V" TM on cutters. Patent date removed from the front pieces of the skate. Model numbers cast in larger type, in notched borders.
Type 3 (1922 to 1935) Sweetheart TM on cutter.
Type 3a (1929 to 1935 and later) Now equiped with depth stops.
Type 4 (1936 and later) Last type simply has "Made in USA" on cutter.
Sharpening3: The blade is sharpened in essentially the same manner as skew chisels. The need to maintain an accurate skew angle is paramount in a plane such as the No 99, because there is very little room to move the blade laterally on the bed in order to adjust for any errors in sharpening angle. The No. 99 is even more difficult than the skew bladed No. 140 to sharpen because the bed angle is only 7 degrees in combination with the fact that there is virtually no lateral adjustment possible because the blade runs in a machined slot. Lee notes the No. 99 is "one of the toughest sharpening problems of any plane blade" but also notes that low bed angles always present problems because the lower the bed angle, the greater the rotation of the blade on the bed to change depth of cut from one side of the blade to the other. Since the plane has a bevel-up blade, the blade is sharpened at the lowest angle consistent with the wood being worked.

Sources1:
1. Walter, John . "Antique & Collectable Stanley Tools, Guide to Identity and Value",   2nd Edition, 1996
2. Smith, Roger K., Reprint of Stanley Catalog No 120 orginally issued in 1923, "Carpenters' and Mechanics Tools", The Stanley Rule and & Level Plant, The Stanley Works, New Britain, Conn., U.S.A.
3. Lee, Leonard, "The Complete Guide to Sharpening",Taunton Press, Inc.,1995
4. Stanley No 99 Type 1,  Tool Collection of Gordon Muster . Fine Condition. Nickel is 50%. Owner mark of "W" scratched on body and one of a matched pair(See No. 98). Purchased March 2001 on Ebay for $58.50.