Dates used:  1972 - 85
Inside of helmet:  Adjustrap, with a
centerpiece of foam padding and
padding around the Adjustrap
Manufacturer:  Sports Product Corp.
Logo:  sticker
Thoughts:  It use to be the Senators, but in '72 they became the Rangers, Texas-style!  
 
Dates used:  1972 - 85
Inside of helmet:  Adjustrap, with a
centerpiece of foam padding and
padding around the Adjustrap
Manufacturer:  Sports Product Corp.
Logo:  screen printed
Thoughts:  Same as above except a smaller logo and it is screen printed.
 
Dates used:  1972 - 85
Inside of helmet:  Adjustrap clear
Manufacturer:  U.S. Cap
Logo:  screen printed
Thoughts:  Another of the duck-billed helmets.
 
Dates used:  1987 - 1993
Inside of helmet:  Adjustrap
Manufacturer:  Sports Product Corp., A
Subsidiary of Laich
Logo:  screen printed
Thoughts:  How about a very, very young Julio Franco?  

 
Dates used:  1987 - 1993
Inside of helmet:  Adjustrap
Manufacturer:  Sports Product Corp., A
Subsidiary of Laich
Logo:  screen printed
Thoughts: 
Just a different style "T" logo.  Slightly larger.
 
Dates used:  1993 - Present
Inside of helmet:  Adjustrap
Manufacturer:  Sports Product Corp., A
Subsidiary of Laich
Logo:  screen printed
Thoughts:  Juan Gonzalez belted quite a few homers in this helmet.  
 
Dates used:  1993 - Present
Inside of helmet:  Adjustrap
Manufacturer:  Sports Product Corp., A
Subsidiary of Laich
Logo:  screen printed
Thoughts:  One word . . . Pudge.