ROCKSHOCK Reverb A1+A2: 2 screws for seat posts

• Made in titanium alloy Grade 5 (TI6L4V)
• 43% lighter as stainless steel
• Beautiful finish
• Excellent resistance to corrosion
• Weight (2 parts): 7.35 g / 0,259 oz

 *Which Roch Shox Reverb do I have (see picture 3)?

A1 (first generation - MY 2011-2013): with silver seat post ring and handwheel
A2 (second generation - MY 2013-2016): with black seat post ring and handle knob
B1 (third generation - from MY 2017): also with black seat post ring and knob but a golden "ROCK SHOX" inscription on the top of the seat post.