1c Green, Attleboro Stamp Co.
Private Affixing-Machine Coil (343 var). Perfs show at top and bottom,
machine notch at bottom, tied by bold "Attleboro Mass." oval cancel on F.
Percy Collingwood (proprieter of Attleboro Stamp Co.) corner card cover to
Lorian O., unsealed for circular rateVERY FINE AND CHOICE. AN EXTREMELY RARE COVER BEARING THE ONE-CENT ATTLEBORO PRIVATE VENDING MACHINE COIL.
In 1909 the Attleboro Stamp Company employed a stamp-affixing machine to apply postage to bulk mailings of its price lists and editions of the Attleboro Philatelist. Although the company served stamp collectors, the Attleboro coil appears to have been a purely utilitarian product, limited in its scope to the basic 1c and 2c stamps necessary for mailing and not intended to create new varieties for collectors. Examples of these coils are scarce to rare, with the pair of Scott 344 priced at $45,000.00 in Scott, among the highest values of all 20th century varieties.
The 1c Attleboro was typically used on wrappers with the printed Attleboro Philatelist corner card. This unsealed envelope is extremely rare.
With 1977 P.F. certificate. Scott lists but does not price this stamp used on a cover. (Image)
1c Green, Attleboro Stamp Co.
Private Affixing-Machine Coil (343 var). Mint N.H. pair, each stamp
with tiny notch at bottom (used by the machine to advance the stamps), rich
color, Extremely Fine, a very scarce pair, Scott Retail as hinged (Image) 
2c Carmine, Schermack Ty. III
Perforations, 5-Hole Control Perfin (344 var). Hole numbers 4-5-7-8
unpunched (these being the control number), tied by "Hudson Term. Sta. N.Y.
Oct. 5, 1910" wavy-line machine datestamp on DeLaval Separator Co.
illustrated corner card cover to Granby Conn., receiving backstamp,
most of top flap removed, Extremely Fine, very scarce and extremely rare on
this attractive advertising cover, accompanied by Jan. 15, 2001
Linn's article discussing control perfins, which were a security
device to thwart stamp theft -- Scott Retail for a normal cover with this
variety is $450.00 (in italics) (Image)
1c Green, Coil (348).
Guide line strip of four, deep rich color and proof-like impression, bold
strikes of "Chicago Ill. Oct. 30" duplex cancel, Very Fine and choice, a
scarce used line strip of four, accompanied by legal-size cover from which
this strip originated, Scott Retail as guide line pair and two singles (Image) 
5c Blue, Coil (351). Mint
N.H. guide line pair, perfect centering with even margins in both
directions, beautiful rich color and detailed impressionEXTREMELY FINE GEM. THIS IS EASILY ONE OF THE FINEST MINT NEVER-HINGED GUIDE LINE PAIRS OF THE 5-CENT VERTICAL COIL IN EXISTENCE. REMARKABLE IN EVERY RESPECT.
Demand for the 5c vertical coil proved to be so low that no others were made.
With 2001 P.F. certificate (Image)
1c Green, Coil (352).
Mint N.H. guide line pair, beautiful rich color on crisp bright
paperVERY FINE AND CHOICE. A BEAUTIFUL MINT NEVER-HINGED GUIDE LINE PAIR OF THE ONE-CENT PERF 12 DOUBLE-LINE WATERMARKED HORIZONTAL COIL.
With 2001 A.P.S. and 2002 P.F. certificates (Image)
10c Yellow, Coil (356).
Lightly hinged, intense color, choice centering side-to-side and wide
margin at top, Very Fine and choice, with 1994 P.F. certificate (Image) 
3c Deep Violet, Bluish
(359). Lightly hinged, intense color, unbelievably wide
marginsEXTREMELY FINE GEM. A MAGNIFICENT EXAMPLE OF THE 3-CENT BLUISH PAPER. VIRTUALLY UNHEARD OF WITH SUCH ENORMOUS MARGINS.
With 1973 and 1999 P.F. certificates (Image)
5c Blue, Bluish (361).
Small h.r., rich color on nicely blued paperVERY FINE AND CHOICE EXAMPLE OF THE 5-CENT BLUISH PAPER.
The 5c is the rarest of the regularly-issued Bluish Paper stamps. The 4c and 8c were not issued thru post offices. (Image)
10c Yellow, Bluish (364).
H.r., vibrant color on deeply blued paper, choice centering with
well-proportioned marginsEXTREMELY FINE. A SUPERB EXAMPLE OF THE 10-CENT BLUISH PAPER.
The 10c is one of the most difficult values of the Bluish Paper issue to obtain in such condition. (Image)
13c Bluish Green, Bluish
(365). Rich color and proof-like impression, neat face-free cancel,
wide marginsVERY FINE AND CHOICE USED EXAMPLE OF THE 13-CENT BLUISH PAPER.
A small supply is known used (from Saginaw Mich.) (Image)