1826 Prov Directory
          Benj. Allen, grocer, 2 & 94 [sic] Broad  (error - should be 2 & 4)
          Joseph Belcher, 10 Chestnut  ( no mention of Joseph Belcher dealing in hardware in 1826 )

1828 Prov Directory
        Allen & Belcher, hardware & cutlery, 4 Broad
           Benj. Allen, grocer, 2 & 94 [sic] Broad (error - should be 2 & 4)
           Joseph Belcher, 4 Broad, 10 Chestnut  ( Joseph's trade is not given but his working address is the same as "Allen & Belcher" )
        Note: It appears that Benj. Allen has taken his 2 storefront location ( 2 & 4 Broad St.), and turned it into a combination grocery and hardware business;
           first with a partner Joseph Belcher, and later by himself. (see BELCHER BRO'S.)

1829 Providence Daily Advertiser  -  In the Dec 2, 1829 issue,"Benj. Allen & Co" mentions woodworking tools, including bench planes and also an assortment
of molding tools of "Smith's make."

1830 Prov Directory
        Benj. Allen & Co, hardware dealers, 4 Broad
           Benj. Allen, grocer & hardware, 2 Broad, Pawt. Turnpike
           Green & Belcher, hardware dealers, 11 Broad  (see BELCHER BRO,S)

1832 Prov Directory
        Benj. Allen & Co, hardware dealers, 4 Broad
           Benj. Allen, hardware, 2 Broad, Pawtucket Turnpike 
          Joseph Belcher, hardware, 11 Broad  ( see BELCHER BRO'S )

1836-1839 Prov Directory
        Benj. Allen & Co, hardware dealers, 48 Weybosset
           Benj. Allen, hardware dealers, 48 Weybosset,  Pawtucket Ave.

In Summary: It seems clear that although there are examples of wood molding planes having only the " ALLEN & Co." stamp on the nose, that Benjamin Allen did not make his own wood molding planes. As a grocer turned hardware dealer, he likely had unstamped planes made by others, then marked them using his own stamp. Examples have been found where Benjamin overstamped "ALLEN & Co" on planes made and stamped by a known planemaker. Example: Two planes made by J.R.Gale, a single cope and an adjustable sash , both overstruck with the "Allen & Co." stamp. Benjamin Allen's store was about a block away from J. R. Gale's " Plane Manufactory" at 77 Weybosset.
     It's possible that Benj. Allen did not overstamp the planes he sold until after 1829, as in that year he mentions selling planes of "Smith's make".  After making such a distinction as to the line of planes he was carrying, it seems unlikely he would overstamp them.