It all depends on the current condition of the pistol. You need to give it some sort of rating like Poor, Fair, Good, Very Good or Excellent. Then I can answer you.
It would be worth around $65 in Excellent shape.
What condition is it in. That determines the value
It would be worth between $65 - $75
it would be worth $40 to $50 in working condition (Still holds C02 no leaks)
The T38 was made by Crosman. If you want an estimate of value then you will have to give more information about the condition of the pistol. If I asked you how much is a 57 Chevy worth, you would ask. "What condition is it in, does it still work?" its the same with any antique. You will have to give it some sort of rating like Poor, Fair, Good, Very Good or Excellent. State if it still holds C02 and does it still fire. All of this determines the current value.
It would be worth between $65 - $75, Add 10% for the box
There have been 3 variations of the 38T target 1964-73: Metal rear sight and Cylinder 1973-76 Plastic rear sight and Cylinder 1976-1985 .177 cal was added. In vary good condition it's worth around $65 to $75 Add 20% for original box. This is a model of the Smith&Wesson Revolver. (350-400 FPS) feet per second.
This model was made between 1964 - 1985 in 3 variations. Today in fair condition it is worth between $25 to $40
The Crosman 38T Target came in .177 & .22 caliber. It was manufactured in 3 different variations over the years. (1964-85) In excellent condition it is worth around $90 plus another 20% for the original box.
Crosman never made a model 35T. They made a model 36 and a model 38T. The original box adds some value to the air gun, but you need to state the current condition of the pistol if you want an answer. You will have to give it some sort of ration like Poor, Fair, Good, Very Good or Excellent condition. Also state if it is still working. Without more information it is not possible to answer you. Check your pistol makes sure of the model number.
Very similar to today. Except not as powerful. The Crosman model 38t was made in the 1960's. Search it on the web. You can also look up the Benjamin model 3100 or Sheridan model c.
The Easy Way: Crosman Offers a service to locate repair shops that repair older Crosman Airguns. See the link below. My Way: I own several Crosman 38T and older 357's I've rebuilt several. Seal Parts from the 38t were used in the design of the 357. Open the link below and then download the Parts manual for the 38t and older 357 and compare the seal part numbers from each pistol and you will find several are the same. They even began with the number "38". Crosman no longer supplies parts for the 38t or 38c but they do have parts for the 357 (Same parts used on both) So you and call customer service and order some of the 38 parts listed on the 357. I was able to rebuild two 38t's this way