It may be too old to be a 130 - if not it must be a very early one. The 115 bhp version also had 6 speeds, but not sure what the TDI badging on the back was as 'standard' on that one - red di could be 130bhp.
Best plan is look at the sticker in the spare wheel well in the boot, as this should state the engine output in kW - can't remember the conversion factor into bhp but you could compare the figure with the latest (130) figures on the VW website.
Chris