You are eligible.
The employee can submit FormI (under proper acknowledgment) one month before the date of retirement (say by notice of resignation).
The employer has to supply the payment of Gratuity within 1month of becoming eligible even if no application by employee is made or employee shall be eligible for interest @........... as decided by central govt which was last noted as @10%p.a.
In your case::: establishment working 6days/week, without the need of any judgement and in line with explanation of continuous service stated in Sec:2A {2(a) (i) (ii)}................................you are eligible.
The provisions of the Act are crystal clear.
You can certainly refer to the judgement.
There are many threads on similar queries at:
https://www.lawyersclubindia.com/forum/display.asp?cat_id=9&forum_id=49#.U3Nt-0eBmXU
e.g;
https://www.lawyersclubindia.com/forum/Clarity-between-gratuity-eligibility-service-5-or-4-8-yrs--28768.asp#.U3NuNEeBmXU