This info. is from the LV guru Rick_d. Based off his info I'd say you have an early '66 as the fresh air vent is still diagonal but you have a locking gas cap door.
Identification marks and model year changes:
1963’s
- The basics: “3” precedes FJ45 on the frame, FJ35 glass, heater, 3” brow
- 3” ‘brow’ over windshield (1963-1966)
- Pop up vent on cowl (1963-64)
- Passenger side squirrel cage heaters. 2 types, one recalculating and one drawing air from passengers kick panel. (Denso part #16500-027-1 for outside air unit)
- Option of rear seat heater
- “Too wide” rear seat with short stop arms. These when folding hit the rear door handles
- Dimpled taillight lens (1963 – early 1964)
- Bottom catch vent window clamp (to ` FJ4514,300)
- Mud flaps (1963-64, and non US versions)
- FJ35 glass markings (1963 only)
- ‘breakaway’ seat rails (1963-64)
- ‘breakaway’ paddle handles (1963-64) w/ spring loaded metal packing
- Unique dome light (1963-65?)
- VIN plate on firewall w/ engine number and year stamped in (1963-64). Rebadged 1965’s were made from 1964 overstock w/ brass “T-65” tag.
- White pyramid rubber floor mats and white vinyl firewall mat (1963-64)
- Front mount sun visors (1963-1966)
- TOYOTA LAND CRUISER banner on tailgate (1963-64)
- Vacuum switch outside of firewall frame (1963-64_
- Foam door weather stripping (1963-66)
- 4 screw vent window hinge (1963-1965/6)
- Screw in headliner bows (1963 -1965/6)
- FJ25 exhaust manifold (1963 and early 1964)
1964’s
- The basics” “4” precedes FJ45 on frame, usually no stock heater, 3” brow
- Recirculating heaters (`option for 1964’s, but rarely seen)
- Correct size rear seat (FJ4514500 up)
- Short arm stops with block mounting for rear seat (FJ4514500-FJ4515100)
- Long arms for seat (FJ4515100 up)
- Map light switch appears left of headlight knob (FJ4516000 and up)
- Dealer add ons (1964 and later)
o Heater box (square unit w/ seat facing fan
o Chrome defrost knob
o Lighter w/ 2 crimps on under dash mount
o Ramsey PTO w/ ‘clown’ knob above ignition switch
1965’s
- The basics: grill on cowl vent, 40 style heating assembly, NO gas tank door, 3” brow (Specter’s/Kopito’s truck is a 1965)
- New paddle door openers w/ rubber backing (1965-1967)
- Open grill cowl vent and wiper motor change (1965-67)
- Map light disappears, hole left of headlight knob has rubber plug (1965-1967)
- Introduction of standard 40 style heater (Denso 87150-60030) and cowl fan (1965-67)
- Rear seat heater (not identical, but very similar to FJ40’s)(1965-67)
- Aluminum “T” year tags (1965-1967) (brass tags are rebadged ‘64’s)
- Black pyramid rubber floor mats and grey vinyl firewall mat (1965-1967)
- Lighter appears on dash (1965-67)
1966’s
- The basics: Grill on cowl vent, 40 style heating assembly, a gas tank door, 3” brow
- Improved seat rails (1966-67)
- Struts and straps for rear seat stabilization (1966-67)
- Move VIN to drivers fender (late 1966)
- Vacuum switch inside firewall frame (1966-67)
- 2 screw cast vent window hinge (1966-67)
- Gas tank lid and rubber cap (1966-67)
- Vented gas tank (1966-1967)
- Side in headliner bows (1966-67)
1967’s
- The basics: 1 ½” brow
- 1 ½” brow above windshield (1967 FJ4526000 +/-)
- Corner mounted sun visors (1967)
- Improved drainage for cowl vent (late 1967)
- Move VIN to passenger fender (1967)
- New weather stripping w/ plastic (steel reinforced) bead (1967)
- Improved venting for gas tank (late 1967)
Non USA Equipment:
- Right hand drive
- Split rear seat and deep extra rear seat (seats 9 short people)
- Interior window guards
- Over windshield vent and wide bolt in headliner bows
- Door pillar lights
- Ambulance doors
- Screw in door panels (all US had grey / white snap in type)
- Rear bumper options
