It is a 155mm. I miscounted, I thought vikingberserker was talking about the one below it.
Photo 1. 105 mm Howitzer
Photo 2. 105mm Howitzer
Photo 3. Artillery Binoculars
Photo 4. My Grandfather's 105 mm Howitzer named "Big Noise"
Photo 5. Target Range Finder
Photo 6. M1918- 155 howitzer
Photo 7. 105mm howitzer
Photo 8. 37mm AA gun
Photo 9. 105mm Howitzer
Photo 10. 37mm AA gun top view.